Some Meteorites Found on Earth Are Believed to Come from Mars

Some meteorites found on Earth are believed to come from Mars because trapped bits of atmosphere in these meteorites match the composition of Mars's atmosphere. What more can be said about this?

A) The comparison to Mars's atmosphere is to recent samples taken by the Viking Landers. However, this is not a problem because Mars's atmosphere has been stable for a long time.
B) The atmospheric samples in the meteorites contained much water vapor, further evidence of a wet period in Mars's past.
C) The atmospheric samples in the meteorites are very different from the samples gathered by the Viking Landers of the present composition of Mars's atmosphere. But the meteorites are believed to contain samples of an ancient Martian atmosphere.
D) Some of the meteoritic rocks have also been traced to specific craters on Mars.